mirror of
https://github.com/osmarks/random-stuff
synced 2025-10-30 21:33:01 +00:00
69 lines
2.7 KiB
HTML
69 lines
2.7 KiB
HTML
<!DOCTYPE html>
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<input type="text" id="text">
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<button id="send">do thing</button>
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<button id="recv">do thing 2</button>
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<canvas id="vis" style="width: 100%; height: 20em; "></canvas>
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<script>
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const ctx = new AudioContext()
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const encoder = new TextEncoder()
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const visCanvas = document.querySelector("#vis")
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const transmit = bytes => {
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const tones = Array.from(bytes).flatMap(x => [x >> 6, x >> 4 & 3, x >> 2 & 3, x & 3])
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console.log(tones)
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let pos = 0
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const oscillator = ctx.createOscillator()
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oscillator.connect(ctx.destination)
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oscillator.start()
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const interval = setInterval(() => {
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const tone = tones[pos]
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oscillator.frequency.value = [200, 400, 600, 800][tone]
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pos++
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if (pos == tones.length) {
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oscillator.stop()
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oscillator.disconnect()
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clearInterval(interval)
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}
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}, 500)
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}
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const analyzer = ctx.createAnalyser()
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//analyzer.smoothingTimeConstant = 0
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const CWIDTH = 512
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const CWIDTH_MINUS_ONE = 511
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const cctx = visCanvas.getContext("2d")
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let q = 0;
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const visualizerLoop = () => {
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const w = analyzer.frequencyBinCount
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const frequencyData = new Uint8Array(w)
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analyzer.getByteFrequencyData(frequencyData)
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const im = cctx.getImageData(1, 0, CWIDTH, w)
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let max = -1;
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let maxIndex = -1;
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for (let i = 0; i < w; i++) {
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im.data[(i * CWIDTH + CWIDTH_MINUS_ONE) * 4 + 3] = 255
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im.data[(i * CWIDTH + CWIDTH_MINUS_ONE) * 4 + 1] = frequencyData[i]
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if (frequencyData[i] > max) {
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max = frequencyData[i]
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maxIndex = i
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}
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}
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console.log((maxIndex + 1) / w * 24000)
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cctx.putImageData(im, 0, 0)
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q++
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requestAnimationFrame(visualizerLoop)
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}
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document.querySelector("#send").addEventListener("click", () => {
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transmit(encoder.encode(document.querySelector("#text").value))
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})
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document.querySelector("#recv").addEventListener("click", () => {
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navigator.mediaDevices.getUserMedia({video: false, audio: true}).then(stream => {
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console.log(stream)
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const node = ctx.createMediaStreamSource(stream)
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node.connect(analyzer)
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visCanvas.height = analyzer.frequencyBinCount
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visCanvas.width = CWIDTH
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cctx.fillStyle = "black"
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cctx.fillRect(0, 0, CWIDTH, analyzer.frequencyBinCount)
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requestAnimationFrame(visualizerLoop)
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})
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})
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</script> |